Stream. Copy ToAsync(Stream, Int32, CancellationToken) Method
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Asynchronously reads all the bytes from the current stream and writes them to another stream, using a specified buffer size and cancellation token.
public: override System::Threading::Tasks::Task ^ CopyToAsync(System::IO::Stream ^ destination, int bufferSize, System::Threading::CancellationToken cancellationToken);
public override System.Threading.Tasks.Task CopyToAsync (System.IO.Stream destination, int bufferSize, System.Threading.CancellationToken cancellationToken);
override this.CopyToAsync : System.IO.Stream * int * System.Threading.CancellationToken -> System.Threading.Tasks.Task
Public Overrides Function CopyToAsync (destination As Stream, bufferSize As Integer, cancellationToken As CancellationToken) As Task
The stream to which the contents of the current stream will be copied.
The size, in bytes, of the buffer. This value must be greater than zero.
The token to monitor for cancellation requests.
A task that represents the asynchronous copy operation.
buffersize is negative or zero.
Either the current stream or the destination stream is disposed.
The current stream does not support reading, or the destination stream does not support writing.
The cancellation token was canceled. This exception is stored into the returned task.
This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as ArgumentException, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by CopyTo(Stream, Int32).